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<H1 class="no-header">key_defined 3x 2024-06-08 ncurses 6.5 Library calls</H1>
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<STRONG><A HREF="key_defined.3x.html">key_defined(3x)</A></STRONG>                  Library calls                 <STRONG><A HREF="key_defined.3x.html">key_defined(3x)</A></STRONG>




</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
       <STRONG>key_defined</STRONG> - test whether a <EM>curses</EM> function key code is defined


</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
       <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>

       <STRONG>int</STRONG> <STRONG>key_defined(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG> <EM>definition</EM><STRONG>);</STRONG>


</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
       The  <STRONG>key_defined</STRONG>  <EM>ncurses</EM>  extension  permits  a  <EM>curses</EM> application to
       determine the function key code, if any, to which the string <EM>definition</EM>
       is bound.


</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
       <STRONG>key_defined</STRONG>  returns the first key code to which <EM>definition</EM> is bound if
       any exists.  If none does, it returns <STRONG>0</STRONG>.  If <EM>definition</EM> is a prefix  of
       another binding, <STRONG>key_defined</STRONG> returns <STRONG>-1</STRONG>.


</PRE><H2><a name="h2-EXTENSIONS">EXTENSIONS</a></H2><PRE>
       <STRONG>define_key</STRONG> is an <EM>ncurses</EM> extension.


</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
       Applications employing <EM>ncurses</EM> extensions should condition their use on
       the visibility of the <STRONG>NCURSES_VERSION</STRONG> preprocessor macro.


</PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
       Thomas Dickey


</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
       <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="define_key.3x.html">define_key(3x)</A></STRONG>, <STRONG><A HREF="keybound.3x.html">keybound(3x)</A></STRONG>, <STRONG><A HREF="keyok.3x.html">keyok(3x)</A></STRONG>



ncurses 6.5                       2024-06-08                   <STRONG><A HREF="key_defined.3x.html">key_defined(3x)</A></STRONG>
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<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
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<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
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